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Loans and Allowance for Credit Losses - Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | $ 78,281 |  | $ 107,555
Unpaid principal balance | 109,125 |  | 139,687
Related allowance | 12,689 |  | 17,778
Average recorded investment | 96,859 | 82,156 |
Interest Income Recognized | 161 | 65 |
Commercial, financial, agricultural and other with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 8,649 |  | 8,080
Unpaid principal balance | 9,601 |  | 8,983
Related allowance | 0 |  | 0
Average recorded investment | 8,592 | 3,258 |
Interest Income Recognized | 51 | 18 |
Real estate construction with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 6,122 |  | 8,491
Unpaid principal balance | 27,005 |  | 35,555
Related allowance | 0 |  | 0
Average recorded investment | 7,877 | 3,646 |
Interest Income Recognized | 0 | 0 |
Residential real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 8,666 |  | 7,928
Unpaid principal balance | 9,269 |  | 8,401
Related allowance | 0 |  | 0
Average recorded investment | 8,516 | 3,354 |
Interest Income Recognized | 37 | 5 |
Commercial real estate with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 16,711 |  | 33,259
Unpaid principal balance | 23,250 |  | 35,401
Related allowance | 0 |  | 0
Average recorded investment | 33,978 | 24,275 |
Interest Income Recognized | 11 | 23 |
Loans to individuals with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 240 |  | 256
Unpaid principal balance | 247 |  | 256
Related allowance | 0 |  | 0
Average recorded investment | 247 | 0 |
Interest Income Recognized | 1 | 0 |
Subtotal with no related allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 40,388 |  | 58,014
Unpaid principal balance | 69,372 |  | 88,596
Related allowance | 0 |  | 0
Average recorded investment | 59,210 | 34,533 |
Interest Income Recognized | 100 | 46 |
Commercial, financial, agricultural and other with an allowance recorded [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 25,702 |  | 26,532
Unpaid principal balance | 26,655 |  | 27,412
Related allowance | 9,846 |  | 10,331
Average recorded investment | 25,803 | 30,350 |
Interest Income Recognized | 19 | 3 |
Real estate construction with related allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 2,860 |  | 2,756
Unpaid principal balance | 3,169 |  | 3,087
Related allowance | 503 |  | 300
Average recorded investment | 2,685 | 10,432 |
Interest Income Recognized | 13 | 0 |
Residential Real Estate With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 2,663 |  | 2,695
Unpaid principal balance | 2,666 |  | 2,696
Related allowance | 1,091 |  | 780
Average recorded investment | 2,457 | 952 |
Interest Income Recognized | 4 | 7 |
Commercial Real Estate With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 6,668 |  | 17,558
Unpaid principal balance | 7,263 |  | 17,896
Related allowance | 1,249 |  | 6,367
Average recorded investment | 6,704 | 5,889 |
Interest Income Recognized | 25 | 9 |
Loans To Individuals With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 0 |  | 0
Unpaid principal balance | 0 |  | 0
Related allowance | 0 |  | 0
Average recorded investment | 0 | 0 |
Interest Income Recognized | 0 | 0 |
Subtotal With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment | 37,893 |  | 49,541
Unpaid principal balance | 39,753 |  | 51,091
Related allowance | 12,689 |  | 17,778
Average recorded investment | 37,649 | 47,623 |
Interest Income Recognized | $ 61 | $ 19 |

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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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